Important tips.Files - are an aspect that should not be underestimated in the nail model. The biggest differences lie in quality, shape, grain and, of course, in price. The price is made up of the above-mentioned facts. Therefore, when selecting your files, pay attention to the flexibility and elasticity of the files. Also pay attention to the abrasion of the leaf (sand leaf or grit). The grit indicates the grain or coarseness of the file.